ECC (Everything Claude Code) is a comprehensive meta-harness toolkit for AI coding assistants. It provides a universal install system, lifecycle hooks, skill management, multi-agent orchestration, evaluation harnesses, and safety validation across multiple agent IDEs (Claude Code, Codex, Cursor, Gemini, OpenCode, and others). The codebase is primarily a Node.js CLI application (published as `ecc-universal`) with secondary Python and Rust components. It includes a sophisticated hook engine (pre/post bash, session lifecycle, tool use), a manifest-driven installer with ownership tracking and path-safety guards, an eval-harness framework with deterministic replay and effect-class isolation, a skill evolution system with provenance tracking, and a multi-agent proximity coordination system. The repository also bundles a large collection of domain-specific skills (video production, compliance checking, visa document translation, financial market data) and extensive documentation translated into multiple languages. While the core architecture is well-structured and demonstrates high craftsmanship in security-critical components, the codebase suffers from some duplication (e.g., taste-application/taste-distillation skills), legacy shims, and a sprawling surface area that increases maintenance burden. The Rust TUI control-plane (`ecc2/`) is explicitly alpha. Overall, it is a production-grade, actively maintained platform with strong engineering practices in its core modules.